Why ExtExcape return 0 (not supported) woth adobe Acrobat 6 though return 1 with version 5?

Question

I posted a question earlier to ask how to remove "save pdf File as" dialog.
It turned out that the ExtEscape function not working right and return 0 with adobe acrobat 6 even though the same code return 1 (success) with adobe acrobat 5.
"The return value is zero if the escape is not implemented."
I did a complete adobe acrobat 6 install. How did this could happen?
I am using an older version of pdfwctrl.h with copyright Copyright 1994 - 2001.
Please help.
Here is the code
static int PDFWriterInit(
HDC hDC,
const _TCHAR *pOutputFileName
PDFINPUT pdfInput;
PDFDocInfo pdfdocinfo;
ZeroMemory(&pdfdocinfo, sizeof pdfdocinfo);
TCharToSingleByte(pOutputFileName, pdfInput.outputfilename,
sizeof pdfInput.outputfilename / sizeof pdfInput.outputfilename[0]);
strcpy(pdfdocinfo.title, "my_title");
strcpy(pdfdocinfo.author, "my_author");
strcpy(pdfdocinfo.subject, "my_subject");
strcpy(pdfdocinfo.keywords, "my_keywords");
// Although it is possible to set the following fields, we do not suggest that
// you do so. If you leave these blank PDF Writer will fill in appropriate values.
// If you set the date yourself and it does not meet the PDF specification it may
// cause trouble for readers of the PDF. PDFWriter will set the appropriate date
// using the system clock, use the application name from the DOCINFO struct and
// set itself as the producer
#if 0
strcpy(pdfdocinfo.creationDate, "my_date");
strcpy(pdfdocinfo.creator, "my_creator");
strcpy(pdfdocinfo.producer, "my_producer");
strcpy(pdfdocinfo.modDate, "my_modDate");
#endif
pdfInput.docinfo = pdfdocinfo;
if (ExtEscape(hDC, PDFFILENAME, sizeof pdfInput,
(LPSTR)&pdfInput, 0, NULL) < 0)
return -1;
return 0;

Answer 1

Did the update info come from Adobe? In any case, you might try a repair (not sure how that is done on a MAC. You can also download updates from Adobe at http://www.adobe.com/support/downloads/product.jsp?product=1&platform=Macintosh.